EP2180322A1 - Prognostic biomarkers for the progression of primary chronic kidney disease - Google Patents

Prognostic biomarkers for the progression of primary chronic kidney disease Download PDF

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Publication number
EP2180322A1
EP2180322A1 EP20080167312 EP08167312A EP2180322A1 EP 2180322 A1 EP2180322 A1 EP 2180322A1 EP 20080167312 EP20080167312 EP 20080167312 EP 08167312 A EP08167312 A EP 08167312A EP 2180322 A1 EP2180322 A1 EP 2180322A1
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Prior art keywords
fragments
adm
kidney disease
chronic kidney
anp
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German (de)
English (en)
French (fr)
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BRAHMS GmbH
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BRAHMS GmbH
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Priority to EP20080167312 priority Critical patent/EP2180322A1/en
Priority to JP2011532546A priority patent/JP5553835B2/ja
Priority to ES14163369.3T priority patent/ES2587717T3/es
Priority to ES09744969.8T priority patent/ES2618077T3/es
Priority to CN200980142234.7A priority patent/CN102203621B/zh
Priority to DK09744969.8T priority patent/DK2356466T3/en
Priority to PCT/EP2009/007739 priority patent/WO2010046137A1/en
Priority to US13/125,631 priority patent/US9128107B2/en
Priority to CN201410548781.8A priority patent/CN104374920B/zh
Priority to EP09744969.8A priority patent/EP2356466B1/en
Priority to EP14163369.3A priority patent/EP2796879B1/en
Publication of EP2180322A1 publication Critical patent/EP2180322A1/en
Priority to JP2013122446A priority patent/JP5718981B2/ja
Priority to HK15102572.5A priority patent/HK1202155A1/xx
Withdrawn legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/74—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving hormones or other non-cytokine intercellular protein regulatory factors such as growth factors, including receptors to hormones and growth factors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2333/00—Assays involving biological materials from specific organisms or of a specific nature
    • G01N2333/435—Assays involving biological materials from specific organisms or of a specific nature from animals; from humans
    • G01N2333/575—Hormones
    • G01N2333/58—Atrial natriuretic factor complex; Atriopeptin; Atrial natriuretic peptide [ANP]; Brain natriuretic peptide [BNP, proBNP]; Cardionatrin; Cardiodilatin
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2800/00—Detection or diagnosis of diseases
    • G01N2800/34—Genitourinary disorders
    • G01N2800/347—Renal failures; Glomerular diseases; Tubulointerstitial diseases, e.g. nephritic syndrome, glomerulonephritis; Renovascular diseases, e.g. renal artery occlusion, nephropathy

Definitions

  • the present invention is in the field of prognostic biomarkers and relates to the prediction of the outcome for patients with chronic kidney disease.
  • CKD Chronic kidney disease
  • K/DOQI Kidney Disease Outcome Quality Initiative
  • eGFR estimated glomerular filtration rate
  • NT-proBNP Amino-terminal proBNP
  • A-type natriuretic peptide (ANP) and adrenomedullin (ADM) are potent hypotensive, diuretic, and natriuretic peptides involved in maintaining cardiovascular and renal hemostasis ( Vesely et al., Cardiovasc Res 2001; 51: 647-658 ; Bunton et al., Pharmacol Ther 2004; 103: 179-201 ).
  • ANP and ADM Increased plasma concentrations of ANP and ADM have been reported in patients with cardiovascular disease and in patients with kidney disease ( Lerman et al., Lancet 1993; 341: 1105-1109 ; Jougasaki et al., Circulation 1995; 92:286-289 ; Winters et al., Biochem Biophys Res Commun 1988; 150: 231-236 ; Ishimitsu et al., J Clin Invest 1994; 94: 2158-2161 ).
  • ADM Adrenomedullin
  • pre-pro-ADM pre-pro-Adrenomedullin
  • the ADM peptide comprises amino acids 95 to 146 of pre-pro-ADM, from which it is formed by proteolytic cleavage.
  • Some peptide fragments of those formed in the cleavage of the pre-proADM have been characterized in detail, in particular the physiologically active peptides adrenomedullin (ADM) and "PAMP", a peptide comprising 20 amino acids (22-41) which follow the 21 amino acids of the signal peptide in pre-Pro-ADM.
  • ADM physiologically active peptides adrenomedullin
  • PAMP a peptide comprising 20 amino acids (22-41) which follow the 21 amino acids of the signal peptide in pre-Pro-ADM.
  • Another fragment of unknown function and high ex vivo stability is midregional proAdrenomedullin (MR-proADM) ( Struck et al. (2004), Peptides 25(8):1369-72 ), for which a reliable quantification method has been developed ( Morgenthaler e
  • ADM may be regarded as a polyfunctional regulatory peptide. It is released into the circulation in an inactive form extended by a C-terminal glycine ( Kitamura et al. (1998), Biochem. Biophys. Res. Commun. 244 (2), 551-555 ).
  • ADM is an effective vasodilator.
  • the hypotensive effect has been associated particularly with peptide segments in the C-terminal part of ADM.
  • Peptide sequences of the N-terminus of ADM on the other hand exhibit hypertensive effects ( Kitamura et al. (2001), Peptides 22, 1713-1718 ).
  • Atrial natriuretic peptide also known as atrial natriuretic factor (ANF)
  • ANP is a peptide hormone comprising 28 amino acid residues (SEQ ID NO:8).
  • the ANP gene comprises 3 exons and 2 introns and codes for a 153 amino acid pre-pro-ANP (SEQ ID NO:6).
  • SEQ ID NO:6 Upon cleavage of an N-terminal signal peptide (25 amino acids) and the two C-terminal amino acids (127/128) proANP is released.
  • ANP comprises residues 99-126 from the C-terminus of the precursor prohormone pro-ANP (SEQ ID NO:7).
  • NT-proANP amino terminal fragment ANP (1-98)
  • NT-proANP amino terminal fragment ANP (1-98)
  • the 98 amino acid NT-proANP may be further processed proteolytically.
  • Mid-regional proANP MR-proANP
  • proANP or any fragments thereof comprising at least amino acid residues 53-90 of proANP. Amino acids 53 to 90 of proANP are illustrated in SEQ ID NO:10 ( Fig. 10 ). Measurement of MR-proANP has been used in differential diagnosis of acute decompensated heart failure (witzhuber et al., Clin Chem 2006; 52: 827-31 ).
  • the present invention relates to a method for prediction of the progression of primary chronic kidney disease (CKD) or for monitoring chronic kidney disease therapy, comprising the following steps:
  • the present invention relates to a method for prediction of the progression of primary chronic kidney disease (CKD) , comprising the following steps:
  • the present invention relates to a method for monitoring chronic kidney disease therapy, comprising the following steps:
  • the method allows for the discrimination of patients with progressing chronic kidney disease from patients with non-progressing chronic kidney disease.
  • Progressing CKD herein relates to CKD that advances and possibly advances to doubling serum creatinine and end-stage renal disease (ESRD).
  • ESRD end-stage renal disease
  • the patient is being classified as a progressor or a non-progressor.
  • a progressor is thus a patient whose CKD will eventually advance into end-stage renal disease (ESRD).
  • the level of ANP or fragments thereof or its precursors or fragments thereof is determine and used as single marker. In another preferred embodiment of the invention the level of ADM or fragments thereof or its precursors or fragments thereof is determined and used as single marker.
  • ANP or fragments thereof or its precursors or fragments thereof are preferably selected from the group comprising NT-proANP, MR-proANP and mature ANP or fragments thereof. Fragments may have preferably at least 12 amino acids in length.
  • ADM or fragments thereof or its precursors or fragments thereof are preferably selected from the group comprising mature ADM, MR-proADM, PAMP and CT-proADM or fragments thereof. Fragments may have preferably at least 12 amino acids in length.
  • the prediction of the progression of primary chronic kidney disease may be improved by additionally determining and using the level of at least one further laboratory parameter or further marker selected from the group comprising: creatinine , GFR ("glomerular filtration rate"; GFR may for example be determined by measuring iohexol-clearance ( Bostom et al., J Am Soc Nephrol 2002; 13: 2140-2144 )), Proteinuria, albumin , CRP, Cystatin C, GDF15, ST2, NGAL, Procalcitonin and fragments thereof, BNP or fragments thereof or its precursors or fragments thereof, particularly proBNP or NT-proBNP, pro-Vasopressin and fragments thereof including copeptin, vasopressin and neurophysin, pro-Endothelin-1 and fragments thereof including CT-proET-1, NT-proET-1, big-Endothelin-1 and Endothelin-1.
  • GFR glomerular filtration rate
  • At least one clinical parameter is determined selected from the group comprising: age, gender, systolic blood pressure, diastolic blood pressure, .body mass index, current smoking habits, antihypertensive treatment.
  • the present invention also pertains to a method for prediction of the progression of primary chronic kidney disease and for monitoring chronic kidney disease therapy as described above, wherein the level of ANP and/or ADM or precursors or fragments thereof either alone or in conjunction with other prognostically useful laboratory or clinical parameters is used for the prediction of the progression of primary chronic kidney disease by a method which may be selected from the following alternatives:
  • the level of MR-proADM is measured using a diagnostic assay comprising one or more capture probes directed against one ore more epitopes located in amino acid positions 45-92 of pre-pro-ADM.
  • the present invention also relates to the use of ANP and/or ADM or fragments thereof or its precursors or fragments thereof for the prediction of renal endpoints in a patient suffering from primary chronic kidney disease.
  • the invention pertains to the use of ANP and/or ADM or fragments thereof or its precursors or fragments thereof for the prediction of the progression of primary chronic kidney disease.
  • chronic kidney disease is a non-diabetic chronic kidney disease.
  • ANP and/or ADM or fragments thereof or its precursors or fragments thereof for the classification of a patient suffering from primary chronic kidney disease into progressor or a non-progressor.
  • ANP and/or ADM or fragments thereof or its precursors or fragments thereof are used as GFR independent predictor and classification marker.
  • the present invention also relates to the use of any of the methods of the invention for monitoring the success of a therapy for chronic kidney disease in a patient suffering from primary chronic kidney disease.
  • the methods of the present invention may be applied at one or more times after the start of a therapy and the results may be compared to each other or to the result before the start of the therapy in order to assess the success of the therapy.
  • an MR-proADM assay having a detection limit below 0.3 nmol/L and/or below the median of a population of patients having primary chronic kidney disease and an interassay precision of ⁇ 30%CV in the normal range is used for the prediction of the progression of primary chronic kidney disease.
  • an MR-proANP assay having a detection limit below 20 pmol/L and/or below the median of a population of patients having primary chronic kidney diseaseand an interassay precision of ⁇ 30%CV in the normal range is used for the prediction of the progression of primary chronic kidney disease.
  • the present invention also relates to the use of a capture probe directed against ANP or fragments thereof or its precursors or fragments thereof and/or ADM or fragments thereof or its precursors or fragments thereof for predicting the progression of primary chronic kidney disease.
  • said capture probes are directed against one ore more epitopes located in amino acid positions 45-92 of pre-pro-ADM.
  • said capture probes are directed against one ore more epitopes located in amino acid positions 53-90 of proANP.
  • fragments of the peptides and precursor peptides as defined herein relate to fragments thereof of at least 12 amino acids in length. Fragments are preferably immunologically detectable fragments of the peptides.
  • proADM pro-Adrenomedullin
  • proADM refers to either the entire molecule of proADM or fragments thereof of at least 12 amino acids including but not limited to ADM, PAMP and MR-proADM.
  • proADM refers to either the entire molecule of proADM or fragments thereof of at least 12 amino acids with the exception of mature ADM.
  • proADM refers to either the entire molecule of proADM or fragments thereof of at least 12 amino acids with the exception of mature ADM or fragments of mature ADM.
  • determining the level of proADM or fragments thereof' refers to determining the level of proADM or fragments thereof, wherein the level of mature ADM and/or fragments of mature ADM is not determined.
  • the amino acid sequence of the precursor peptide of Adrenomedulin is given in Fig. 1 (SEQ ID NO:1).
  • Pro-Adrenomedullin relates to amino acid residues 22 to 185 of the sequence of pre-pro-Adrenomedullin.
  • the amino acid sequence of pro-Adrenomedullin is given in Fig. 2 (SEQ ID NO:2).
  • the pro-ADM N-terminal 20 peptide (PAMP) relates to amino acid residues 22-41 of pre-proADM.
  • the amino acid sequence of PAMP is given in Fig. 3 (SEQ ID NO:3).
  • MR-pro-Adrenomedullin relates to amino acid residues 45-92 of pre-pro-ADM.
  • the amino acid sequence of MR-pro-ADM is provided in Fig. 4 (SEQ ID NO:4).
  • the amino acid sequence of mature Adrenomedullin (ADM) is given in Fig. 5 (SEQ ID NO:5).
  • ANP The amino acid sequence of ANP is given in Fig. 8 (SEQ ID NO:8).
  • the sequence of the 153 amino acid pre-pro-ANP is shown in Fig. 6 (SEQ ID NO:6).
  • Fig. 7 The sequence of the 153 amino acid pre-pro-ANP is shown in Fig. 6 (SEQ ID NO:6).
  • ANP comprises residues 99-126 from the C-terminus of the precursor prohormone pro-ANP. This prohormone is cleaved into the mature 28 amino acid peptide ANP, also known as ANP (1-28) or ⁇ -ANP, and the amino terminal fragment ANP (1-98) (NT-proANP, Fig.
  • Mid-regional proANP is defined as NT-proANP or any fragments thereof comprising at least amino acid residues 53-90 (SEQ ID NO:10 in Fig. 10 ) of proANP.
  • fragment refers to smaller proteins or peptides derivable from larger proteins or peptides, which hence comprise a partial sequence of the larger protein or peptide. Said fragments are derivable from the larger proteins or peptides by saponification of one or more of its peptide bonds.
  • level in expressions such as “level of a protease”, “analyte level” and similar expressions, refers to the quantity of the molecular entity mentioned in the respective context, or in the case of enzymes it can also refer to the enzyme activity.
  • said level of Pro-Adrenomedullin or fragments thereof and/or proANP or fragments thereof is determined and used as single marker.
  • the prediction of the progression of primary chronic kidney disease may be improved by additionally determining and using the level of at least one further laboratory parameter selected from the group comprising: creatinine , GFR ("glomerular filtration rate"; GFR may for example be determined by measuring iohexol-clearance ( Bostom et al., J Am Soc Nephrol 2002; 13: 2140-2144 )), Proteinuria, albumin ,CRP, , Cystatin C, GDF15, ST2, NGAL, Procalcitonin and fragments thereof, BNP or fragments thereof or its precursors or fragments thereof, particularly proBNP or NT-proBNP, pro-Vasopressin and fragments thereof including copeptin, vasopressin and neurophysin, pro-Endothelin-1 and fragments thereof including CT-proET-1, NT-proET-1, big-Endothelin-1 and Endothelin-1.
  • GFR glomerular filtration rate
  • additional determining does not imply, albeit not exclude, that such determinations are technically combined.
  • additionally using is defined as any kind of mathematical combination of parameters - be it laboratory and/or clinical parameters -- that yield a prediction of the progression of primary chronic kidney disease
  • One example of such mathematical combination is the Cox proportional hazards analysis, from which the risk of a subject suffering from primary chronic kidney disease for progression of the disease can be derived, but other methods maybe used as well.
  • the invention also involves comparing the level of marker for the individual with a predetermined value.
  • the predetermined value can take a variety of forms. It can be single cut-off value: This can be for instance a median or mean or the 75 th , 90 th , 95 th or 99 th percentile of a reference population. This can be for instance also an "optimal" cut-off value.
  • the optimal cut-off value for a given marker is the value where the product of diagnostic sensitivity and specificity is maximal for this marker.
  • Diagnostic sensitivity is the relative fraction of patients, carrying the disease or the risk for developing the disease (depending on the diagnostic or prognostic question to be answered in any particular case), which are correctly recognized as such by a marker ("true positives")
  • the diagnostic specificity is the relative fraction of patients, not carrying the disease or the risk for developing the disease (depending on the diagnostic or prognostic question to be answered in any particular case), which are recognized as such by a marker ("true negatives").
  • This can by a cut-off value optimized for a maximal negative predictive value or maximal positive predictive value, depending on clinical or economical needs.
  • the predetermined value can be established based upon comparative groups, such as where the risk in one defined group is double the risk in another defined group. It can be a range, for example, where the tested population is divided equally (or unequally) into groups, such as a low-risk group, a medium-risk group and a high-risk group, or into quartiles, the lowest quartile being individuals with the lowest risk and the highest quartile being individuals with the highest risk.
  • the predetermined value can vary among particular reference populations selected, depending on their habits, ethnicity, genetics etc. Accordingly, the predetermined values selected may take into account the category in which an individual falls. Appropriate ranges and categories can be selected with no more than routine experimentation by those of ordinary skill in the art.
  • threshold In the context of the present invention, the terms “threshold”, “threshold value”, “cut-off' and “cut-off value” are used synonymously.
  • MR-proADM and/or MR-proANP value are for instance the NRI (Net Reclassification Index) or the IDI (Integrated Discrimination Index).
  • the indices can be calculated according to Pencina ( Pencina MJ, et al.: Evaluating the added predictive ability of a new marker: from area under the ROC curve to reclassification and beyond. Stat Med. 2008;27:157-172 ).
  • particular thresholds for one or more markers in a panel are not relied upon to determine if a profile of marker levels obtained from a subject are indicative of a particular diagnosis/prognosis. Rather, the present invention may utilize an evaluation of a marker panel "profile" as a unitary whole.
  • a particular "fingerprint" pattern of changes in such a panel of markers may, in effect, act as a specific diagnostic or prognostic indicator. As discussed herein, that pattern of changes may be obtained from a single sample, or from temporal changes in one or more members of the panel (or a panel response value).
  • a panel herein refers to a set of markers.
  • a panel response value can be derived by various methods.
  • Cox proportional hazards analysis Another example is optimizing ROC curves: This can be achieved by plotting ROC curves for the sensitivity of a particular panel of markers versus 1-(specificity) for the panel at various cut-offs.
  • a profile of marker measurements from a subject is considered together to provide a global probability (expressed either as a numeric score or as a percentage risk) of a diagnosis or prognosis.
  • an increase in a certain subset of markers may be sufficient to indicate a particular diagnosis/prognosis in one patient, while an increase in a different subset of markers may be sufficient to indicate the same or a different diagnosis/prognosis in another patient.
  • Weighting factors may also be applied to one or more markers in a panel, for example, when a marker is of particularly high utility in identifying a particular diagnosis/prognosis, it may be weighted so that at a given level it alone is sufficient to signal a positive result. Likewise, a weighting factor may provide that no given level of a particular marker is sufficient to signal a positive result, but only signals a result when another marker also contributes to the analysis.
  • markers and/or marker panels are selected to exhibit at least about 70% sensitivity, more preferably at least about 80% sensitivity, even more preferably at least about 85% sensitivity, still more preferably at least about 90% sensitivity, and most preferably at least about 95% sensitivity, combined with at least about 70% specificity, more preferably at least about 80% specificity, even more preferably at least about 85% specificity, still more preferably at least about 90% specificity, and most preferably at least about 95% specificity.
  • both the sensitivity and specificity are at least about 75%, more preferably at least about 80%, even more preferably at least about 85%, still more preferably at least about 90%, and most preferably at least about 95%.
  • the term "about” in this context refers to +/- 5% of a given measurement.
  • a positive likelihood ratio, negative likelihood ratio, odds ratio, or hazard ratio is used as a measure of a test's ability to predict risk or diagnose a disease.
  • a value of 1 indicates that a positive result is equally likely among subjects in both the "diseased" and "control" groups; a value greater than 1 indicates that a positive result is more likely in the diseased group; and a value less than 1 indicates that a positive result is more likely in the control group.
  • markers and/or marker panels are preferably selected to exhibit a positive or negative likelihood ratio of at least about 1.5 or more or about 0.67 or less, more preferably at least about 2 or more or about 0.5 or less, still more preferably at least about 5 or more or about 0.2 or less, even more preferably at least about 10 or more or about 0.1 or less, and most preferably at least about 20 or more or about 0.05 or less.
  • the term "about” in this context refers to +/- 5% of a given measurement.
  • markers and/or marker panels are preferably selected to exhibit an odds ratio of at least about 2 or more or about 0.5 or less, more preferably at least about 3 or more or about 0.33 or less, still more preferably at least about 4 or more or about 0.25 or less, even more preferably at least about 5 or more or about 0.2 or less, and most preferably at least about 10 or more or about 0.1 or less.
  • the term "about” in this context refers to +/- 5% of a given measurement.
  • a value of 1 indicates that the relative risk of an endpoint (e.g. , death) is equal in both the "diseased" and “control” groups; a value greater than 1 indicates that the risk is greater in the diseased group; and a value less than 1 indicates that the risk is greater in the control group.
  • markers and/or marker panels are preferably selected to exhibit a hazard ratio of at least about 1.1 or more or about 0.91 or less, more preferably at least about 1.25 or more or about 0.8 or less, still more preferably at least about 1.5 or more or about 0.67 or less, even more preferably at least about 2 or more or about 0.5 or less, and most preferably at least about 2.5 or more or about 0.4 or less.
  • the term "about” in this context refers to +/5% of a given measurement.
  • associating a diagnostic or prognostic indicator, with a diagnosis or with a prognostic risk of a future clinical outcome is a statistical analysis.
  • a marker level of greater than X may signal that a patient is more likely to suffer from an adverse outcome than patients with a level less than or equal to X, as determined by a level of statistical significance.
  • a change in marker concentration from baseline levels may be reflective of patient prognosis, and the degree of change in marker level may be related to the severity of adverse events.
  • Statistical significance is often determined by comparing two or more populations, and determining a confidence interval and/or a p value. See, e.g.
  • Preferred confidence intervals of the invention are 90%, 95%, 97.5%, 98%, 99%, 99.5%, 99.9% and 99.99%, while preferred p values are 0.1, 0.05, 0.025, 0.02, 0.01, 0.005, 0.001, and 0.0001.
  • multiple determinations of diagnostic or prognostic markers can be made, and a temporal change in the marker can be used to determine a diagnosis or prognosis.
  • a marker concentration in a subject sample may be determined at an initial time, and again at a second time from a second subject sample.
  • an increase in the marker from the initial time to the second time may be indicative of a particular diagnosis, or a particular prognosis.
  • a decrease in the marker from the initial time to the second time may be indicative of a particular diagnosis, or a particular prognosis.
  • sample refers to a sample of bodily fluid obtained for the purpose of diagnosis, prognosis, or evaluation of a subject of interest, such as a patient.
  • Preferred test samples include blood, serum, plasma, cerebrospinal fluid, urine, saliva, sputum, and pleural effusions.
  • one of skill in the art would realize that some test samples would be more readily analyzed following a fractionation or purification procedure, for example, separation of whole blood into serum or plasma components.
  • said sample is selected from the group comprising a blood sample, a serum sample, a plasma sample, and a urine sample or an extract of any of the aforementioned samples.
  • patient refers to a living human or non-human organism that is receiving medical care or that should receive medical care due to a disease. This includes persons with no defined illness who are being investigated for signs of pathology. Thus, the methods and assays described herein are applicable to both human and veterinary disease.
  • correlating refers to comparing the presence or amount of the marker(s) in a patient to its presence or amount in persons known to suffer from, or known to be at risk of, a given condition; or in persons known to be free of a given condition.
  • a marker level in a patient sample can be compared to a level known to be associated with a specific diagnosis.
  • the sample's marker level is said to have been correlated with a diagnosis; that is, the skilled artisan can use the marker level to determine whether the patient suffers from a specific type diagnosis, and respond accordingly.
  • the sample's marker level can be compared to a marker level known to be associated with a good outcome (e.g. , the absence of disease, etc. ) .
  • a profile of marker levels are correlated to a global probability or a particular outcome.
  • a “prognosis” refers to assignment of a probability that a given course or outcome will occur. This is often determined by examining one or more "prognostic indicators". These are markers, the presence or amount of which in a patient (or a sample obtained from the patient) signal a probability that a given course or outcome will occur. For example, when one or more prognostic indicators reach a sufficiently high level in samples obtained from such patients, the level may signal that the patient is at an increased probability for eventually advancing into end-stage renal disease (ESRD), i.e. the patient has an increased probability of being a "progressor".
  • ESRD end-stage renal disease
  • MR-proADM comprises amino acids 45-92 of pre-proADM.
  • the level of proADM or fragments thereof is measured using a diagnostic assay using one or more capture probes directed against one ore more epitopes located in amino acid positions 45-92 of pre-proADM.
  • MR-proANP means any fragments of proANP comprising amino acids 53-90 of proANP.
  • the level of proANP or fragments thereof is measured using a diagnostic assay using one or more capture probes directed against one ore more epitopes located in amino acid positions 53-90 ofproANP.
  • an “assay” or “diagnostic assay” can be of any type applied in the field of diagnostics. Such an assay may be based on the binding of an analyte to be detected to one or more capture probes with a certain affinity. Concerning the interaction between capture molecules and target molecules or molecules of interest, the affinity constant is preferably greater than 10 8 M -1 .
  • the level of the above-mentioned markers can be obtained by any art recognized method. Typically, the level is determined by measuring the level or activity of the marker in a body fluid, for example, blood, lymph, saliva, urine and the like. The level can be determined by immunoassays or other conventional techniques for determining the level of the marker. Recognized methods include sending samples of a patient's body fluid to a commercial laboratory for measurement, but also performing the measurement at the point-of-care.
  • capture molecules are molecules which may be used to bind target molecules or molecules of interest, i.e. analytes, from a sample. Capture molecules must thus be shaped adequately, both spatially and in terms of surface features, such as surface charge, hydrophobicity, hydrophilicity, presence or absence of lewis donors and/or acceptors, to specifically bind the target molecules or molecules of interest.
  • the binding may for instance be mediated by ionic, van-der-Waals, pi-pi, sigma-pi, hydrophobic or hydrogen bond interactions or a combination of two or more of the aforementioned interactions between the capture molecules and the target molecules or molecules of interest.
  • capture molecules may for instance be selected from the group comprising a nucleic acid molecule, a carbohydrate molecule, a PNA molecule, a protein, an antibody, a peptide or a glycoprotein.
  • the capture molecules are antibodies, including fragments thereof with sufficient affinity to a target or molecule of interest, and including recombinant antibodies or recombinant antibody fragments, as well as chemically and/or biochemically modified derivatives of said antibodies or fragments derived from the variant chain with a length of at least 12 amino acids thereof.
  • the preferred detection methods comprise immunoassays in various formats such as for instance radioimmunoassays, chemiluminescence- and fluorescence- immunoassays, Enzyme-linked immunoassays (ELISA), Luminex-based bead arrays, protein microarray assays, and rapid test formats such as for instance immunochromatographic strip tests.
  • immunoassays in various formats such as for instance radioimmunoassays, chemiluminescence- and fluorescence- immunoassays, Enzyme-linked immunoassays (ELISA), Luminex-based bead arrays, protein microarray assays, and rapid test formats such as for instance immunochromatographic strip tests.
  • the assays can be homogenous or heterogeneous assays, competitive and non-competive sandwich assays.
  • the assay is in the form of a sandwich assay, which is a noncompetitive immunoassay, wherein the molecule to be detected and/or quantified is bound to a first antibody and to a second antibody.
  • the first antibody may be bound to a solid phase, e.g. a bead, a surface of a well or other container, a chip or a strip
  • the second antibody is an antibody which is labeled, e.g. with a dye, with a radioisotope, or a reactive or catalytically active moiety.
  • the amount of labeled antibody bound to the analyte is then measured by an appropriate method.
  • the general composition and procedures involved with "sandwich assays" are well-established and known to the skilled person. ( The Immunoassay Handbook, Ed. David Wild, Elsevier LTD, Oxford; 3rd ed. (May 2005), ISBN-13: 978-0080445267 ; Hultschig C et al., Curr Opin Chem Biol. 2006 Feb;10(1):4-10. PMID: 16376134 ), incorporated herein by reference.
  • the assay comprises two capture molecules, preferably antibodies which are both present as dispersions in a liquid reaction mixture, wherein a first marking component is attached to the first capture molecule, wherein said first marking component is part of a marking system based on fluorescence- or chemiluminescence-quenching or amplification, and a second marking component of said marking system is attached to the second capture molecule, so that upon binding of both capture molecules to the analyte a measurable signal is generated that allows for the detection of the formed sandwich complexes in the solution comprising the sample.
  • said marking system comprises rare earth cryptates or rare earth chelates in combination with a fluorescence dye or chemiluminescence dye, in particular a dye of the cyanine type.
  • fluorescence based assays comprise the use of dyes, which may for instance be selected from the group comprising FAM (5-or 6-carboxyfluorescein), VIC, NED, Fluorescein, Fluoresceinisothiocyanate (FITC), IRD-700/800, Cyanine dyes, such as CY3, CY5, CY3.5, CY5.5, Cy7, Xanthen, 6-Carboxy-2',4',7',4,7-hexachlorofluorescein (HEX), TET, 6-Carboxy-4',5'-dichloro-2',7'-dimethodyfluorescein (JOE), N,N,N',N'-Tetramethyl-6-carboxyrhodamine (TAMRA), 6-Carboxy-X-rhodamine (ROX), 5-Carboxyrhodamine-6G (R6G5), 6-carboxyrhodamine-6G (RG6), Rhodamine
  • chemiluminescence based assays comprise the use of dyes, based on the physical principles described for chemiluminescent materials in Kirk-Othmer, Encyclopedia of chemical technology, 4th ed., executive editor, J. I. Kroschwitz; editor, M. Howe-Grant, John Wiley & Sons, 1993, vo1.15, p. 518-562 , incorporated herein by reference, including citations on pages 551-562.
  • Preferred chemiluminescent dyes are Acridiniumesters.
  • a MR-proADM assay having a detection limit below 0.3 nmol/L and an interassay precision of ⁇ 30%CV in the normal range for predicting a first adverse event in a subject or identifying a subject having an enhanced risk for getting a first adverse event.
  • Another embodiment of the present invention is the use of a capture probe, e.g. antibody directed against proADM or fragments thereof for predicting a first adverse event in a subject or identifying a subject having an enhanced risk for getting a first adverse event.
  • a capture probe e.g. antibody directed against proADM or fragments thereof for predicting a first adverse event in a subject or identifying a subject having an enhanced risk for getting a first adverse event.
  • Especially preferred in the context of the present invention is the use of one or more antibodies which are directed against an epitope included in the amino acids positions 45-92 of pre-proADM and/or against an epitope included in the amino acids positions 53-90 of proANP.
  • the aim of the present study was to investigate the predictive value of ANP and ADM, using novel sandwich immunoassays covering the midregional epitopes of the more stable prohormone fragments (MR-proANP and MR-proADM), for kidney disease progression in a prospective 7-year follow up study in a cohort of patients with primary CKD.
  • Table 1 shows NT-proBNP, MR-proANP, and MR-proADM plasma concentrations at baseline GFR stratified in stages according to the K/DOQI clinical practice guidelines for chronic kidney disease. There was a continuous increase of median NT-proBNP, MR-proANP, and MR-proADM plasma concentrations across the CKD stages. Furthermore, nonparametric correlation analyses revealed significant associations between GFR and all three parameters (Table 2).
  • follow-up was available in 177 out of the 227 enrolled patients. The median duration of follow-up after completion of the baseline investigation was 53 months (range 3 to 84 months).
  • NT-proBNP 321 vs. 84 ng/L
  • MR-proANP 164 vs. 74 pmol/L
  • MR-proADM 1.13 vs. 0.55 nmol/L
  • Kaplan-Meier curve analyses of the 177 patients with CKD who were stratified into two groups according to the median of MR-proANP, and MR-proADM at baseline are shown in Figures 11 to 12 .
  • Patients who had GFR values below the median and MR-proANP and MR-proADM plasma concentrations above the median had a worse renal prognosis and significant shorter progression time compared with patients with GFR values above the median and MR-proANP and MR-proADM plasma concentrations below the median [mean time to progression in months was 51.1 (95%CI 45.2-57.1) vs. 71.4 (95%CI 64.7-78.1), p ⁇ 0.001 for MR-proANP; and 51.6 (95%CI 45.6-57.6) vs.
  • the present study is the first prospective long-term observation investigating the prognostic value of MR-proANP and MR-proADM for renal disease progression in Caucasian patients with primary CKD.
  • Our data indicate that increased MR-proANP and MR-proADM plasma concentrations at baseline are strong predictors of renal endpoints which are even independent from GFR.
  • K/DOQI recommendations and routinely reported estimates of GFR substantial success has been achieved in screening for undiagnosed CKD ( National Kidney Foundation. Am J Kidney Dis 2002; 39 (2 Suppl 1): S1-266 ; Centers for Disease Control and Prevention (CDC), Morb Mortal Wkly Rep 2007; 56: 161-165 ).
  • GFR in our study was not calculated by a formula but was measured by iohexol clearance which is considered an exact method to measure kidney function. This method, however, is laborious and is a burden for the patient due to the application of contrast media and the collection of several blood samples.
  • Measurement of MR-proANP or MR-proADM is an alternative and simple method which provides a good approximation of kidney function and a well performing predictor for the progression of kidney disease which performs equal to GFR.
  • Exclusion criteria were treatment with immunosuppressive agents, fish oil or erythropoietin, serum creatinine above 6 mg/dL, diabetes mellitus of any type, malignancy, liver, thyroid or infectious disease, nephrotic syndrome (defined as proteinuria >3.5 g/1.73 m 2 /day), organ transplantation, allergy to ionic contrast media and pregnancy.
  • immunosuppressive agents fish oil or erythropoietin
  • serum creatinine above 6 mg/dL
  • diabetes mellitus of any type malignancy
  • liver thyroid or infectious disease
  • nephrotic syndrome defined as proteinuria >3.5 g/1.73 m 2 /day
  • organ transplantation defined as proteinuria >3.5 g/1.73 m 2 /day
  • Antihypertensive medication was withheld on the day of study enrollment in order to minimize interference with measurements of GFR.
  • the primary cause of kidney disease was glomerulonephritis in 97 (biopsy-confirmed in 90) patients, adult polycystic kidney disease in 37 patients, interstitial nephritis in 24 patients, other types of kidney disease in 43 patients and unknown in 26 patients.
  • Plasma NT-proBNP was measured on a Modular Analytics E170 System (Roche Diagnostics, Mannheim, Germany) ( Spanaus et al., Clin Chem 2007; 53: 1264-1272 ).
  • MR-proANP and MR-proADM plasma concentrations were measured by commercially available immunoluminometric assays (B.R.A.H.M.S. AG, Hennigsdorf Germany). The precision of these two methods has been evaluated and described previously ( Morgenthaler et al., Clin Chem 2004; 50: 234-236 ; Morgenthaler et al., Clin Chem 2005; 51: 1823-1829 .).
  • the Spearman coefficient of rank correlation was used to assess the relationship between the four main study parameters (i.e., GFR, NT-proBNP, MR-proANP, and MR-proADM).
  • Kaplan-Meier estimates of the distribution of times from baseline to renal endpoints were generated, for patients with GFR, NT-proBNP, MR-proANP, and MR-proADM above and below the median value of the entire study population; logrank tests were calculated to compare the survival curves between the groups.
  • Univariate Cox proportional-hazards regression analysis was performed, with all four parameters dichotomized according to the median concentration of the entire cohort.
  • Table 4 The association of baseline variables with progression of kidney disease during the observation period using multiple Cox proportional hazards regression models Model 1 Model 2 Model 3 Adjusted for age and sex Adjusted for age, sex GFR, and proteinuria Adjusted for age, sex , GFR proteinuria, and NT-proBNP Variable (increment) HR (95% CI) p HR (95% CI) p HR (95% CI) p GFR (per 1 SD 0.21 (0.13- ⁇ 0.001 - - increase)* 0.34) Proteinuria (per 1 1.27 (1.02- 0.032 - - SD increase) ⁇ 1.58) NT-proBNP (per 1 SD increase) ⁇ 1.45 (1.24-1.69) ⁇ 0,001 1.15 (0.96- 1.38) # 0.127 - MR-proANP (per 2.88(2.25- ⁇ 0.001 2.11(1.59- ⁇ 0.001 2.90 (1.94- ⁇ 0.001 1 SD increase) ⁇ 3.68) 2.80) #

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